MEMS Actuation System

ABSTRACT

A multi-axis MEMS assembly includes: a micro-electrical-mechanical system (MEMS) actuator configured to provide linear three-axis movement, the micro-electrical-mechanical system (MEMS) actuator including: an in-plane MEMS actuator, and an out-of-plane MEMS actuator including a multi-morph piezoelectric actuator; an optoelectronic device coupled to the in-plane MEMS actuator; and a lens barrel assembly coupled to the out-of-plane MEMS actuator.

RELATED CASE(S)

This application claims the benefit of U.S. Provisional Application No.:62/736,913 filed on 26 Sep. 2018; the contents of which are incorporatedherein by reference.

TECHNICAL FIELD

This disclosure relates to actuators in general and, more particularly,to miniaturized MEMS actuators configured for use within camerapackages.

BACKGROUND

As is known in the art, actuators may be used to convert electronicsignals into mechanical motion. In many applications such as e.g.,portable devices, imaging-related devices, telecommunicationscomponents, and medical instruments, it may be beneficial for miniatureactuators to fit within the small size, low power, and cost constraintsof these application.

Micro-electrical-mechanical system (MEMS) technology is the technologythat in its most general form may be defined as miniaturized mechanicaland electro-mechanical elements that are made using the techniques ofmicrofabrication. The critical dimensions of MEMS devices may vary fromwell below one micron to several millimeters. In general, MEMS actuatorsare more compact than conventional actuators, and they consume lesspower.

SUMMARY OF DISCLOSURE

In one implementation, a multi-axis MEMS assembly includes: amicro-electrical-mechanical system (MEMS) actuator configured to providelinear three-axis movement, the micro-electrical-mechanical system(MEMS) actuator including: an in-plane MEMS actuator, and anout-of-plane MEMS actuator including a multi-morph piezoelectricactuator; an optoelectronic device coupled to the in-plane MEMSactuator; and a lens barrel assembly coupled to the out-of-plane MEMSactuator.

One or more of the following features may be included. The lens barrelassembly may include a plurality of discrete lenses. The in-plane MEMSactuator may be an image stabilization actuator. The in-plane MEMSactuator may be configured to provide linear X-axis movement and linearY-axis movement. The in-plane MEMS actuator may be further configured toprovide rotational Z-axis movement. The out-of-plane MEMS actuator maybe an autofocus actuator. The out-of-plane MEMS actuator may beconfigured to provide linear Z-axis movement. The multi-morphpiezoelectric actuator may include a bending piezoelectric actuator. Themulti-morph piezoelectric actuator may include: a moveable stageconfigured to be affixed to the lens barrel assembly. The multi-morphpiezoelectric actuator may further include: a rigid frame assembly. Themulti-morph piezoelectric actuator may further include: at least onedeformable piezoelectric portion configured to couple the moveable stageto the rigid frame assembly. The rigid frame assembly of the multi-morphpiezoelectric actuator of the out-of-plane MEMS actuator may beconfigured to be coupled to a support assembly.

In another implementation, a multi-axis MEMS assembly includes: amicro-electrical-mechanical system (MEMS) actuator configured to providelinear three-axis movement, the micro-electrical-mechanical system(MEMS) actuator including: an in-plane MEMS actuator, and anout-of-plane MEMS actuator including a multi-morph piezoelectricactuator; an optoelectronic device coupled to the in-plane MEMSactuator; and a lens barrel assembly coupled to the out-of-plane MEMSactuator; wherein the in-plane MEMS actuator is an image stabilizationactuator and the out-of-plane MEMS actuator is an autofocus actuator.

One or more of the following features may be included. The in-plane MEMSactuator may be configured to provide linear X-axis movement and linearY-axis movement. The in-plane MEMS actuator may be further configured toprovide rotational Z-axis movement. The out-of-plane MEMS actuator maybe configured to provide linear Z-axis movement.

In another implementation, a multi-axis MEMS assembly includes: amicro-electrical-mechanical system (MEMS) actuator configured to providelinear three-axis movement, the micro-electrical-mechanical system(MEMS) actuator including: an in-plane MEMS actuator, and anout-of-plane MEMS actuator including a multi-morph piezoelectricactuator; an optoelectronic device coupled to the in-plane MEMSactuator; and a lens barrel assembly coupled to the out-of-plane MEMSactuator; wherein the multi-morph piezoelectric actuator includes: amoveable stage configured to be affixed to the lens barrel assembly, arigid frame assembly, and at least one deformable piezoelectric portionconfigured to couple the moveable stage to the rigid frame assembly

One or more of the following features may be included. The rigid frameassembly of the multi-morph piezoelectric actuator of the out-of-planeMEMS actuator may be configured to be coupled to a support assembly.

The details of one or more implementations are set forth in theaccompanying drawings and the description below. Other features andadvantages will become apparent from the description, the drawings, andthe claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a MEMS package in accordance withvarious embodiments of the present disclosure;

FIG. 2A is a diagrammatic view of an in-plane MEMS actuator with theoptoelectronic device in accordance with various embodiments of thepresent disclosure;

FIG. 2B is a perspective view of an in-plane MEMS actuator with theoptoelectronic device in accordance with various embodiments of thepresent disclosure;

FIG. 3 is a diagrammatic view of an in-plane MEMS actuator in accordancewith various embodiments of the present disclosure;

FIG. 4 is a diagrammatic view of a comb drive sector in accordance withvarious embodiments of the present disclosure;

FIG. 5 is a diagrammatic view of a comb pair in accordance with variousembodiments of the present disclosure;

FIG. 6 is a diagrammatic view of fingers of the comb pair of FIG. 5 inaccordance with various embodiments of the present disclosure;

FIGS. 7A-7C are diagrammatic views of an out-of-plane actuator inaccordance with various embodiments of the present disclosure;

FIG. 8 is a diagrammatic view of a MEMS package in accordance withvarious embodiments of the present disclosure;

FIG. 9 is another diagrammatic view of a MEMS package in accordance withvarious embodiments of the present disclosure; and

FIG. 10 is another diagrammatic view of an out-of-plane actuator inaccordance with various embodiments of the present disclosure.

Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS System Overview:

Referring to FIG. 1, there is shown MEMS package 10, in accordance withvarious aspects of this disclosure. In this example, MEMS package 10 isshown to include printed circuit board 12, multi-axis MEMS assembly 14,driver circuits 16, electronic components 18, flexible circuit 20, andelectrical connector 22. Multi-axis MEMS assembly 14 may includemicro-electrical-mechanical system (MEMS) actuator 24 (configured toprovide linear three-axis movement) and optoelectronic device 26 coupledto micro-electrical-mechanical system (MEMS) actuator 24.

As will be discussed below in greater detail, examples ofmicro-electrical-mechanical system (MEMS) actuator 24 may include butare not limited to an in-plane MEMS actuator, an out-of-plane MEMSactuator, and a combination in-plane/out-of-plane MEMS actuator. Forexample and if micro-electrical-mechanical system (MEMS) actuator 24 isan in-plane MEMS actuator, the in-plane MEMS actuator may include anelectrostatic comb drive actuation system (as will be discussed below ingreater detail). Additionally, if micro-electrical-mechanical system(MEMS) actuator 24 is an out-of-plane MEMS actuator, the out-of-planeMEMS actuator may include a piezoelectric actuation system orelectrostatic actuation system. And if micro-electrical-mechanicalsystem (MEMS) actuator 24 is a hybrid in-plane/out-of-plane MEMSactuator, the combination in-plane/out-of-plane MEMS actuator mayinclude an electrostatic comb drive actuation system and a piezoelectricactuation system.

As will be discussed below in greater detail, examples of optoelectronicdevice 26 may include but are not limited to an image sensor, a holderassembly, a UV filter and/or a lens assembly. Examples of electroniccomponents 18 may include but are not limited to various electronic orsemiconductor components and devices. Flexible circuit 20 and/orconnector 22 may be configured to electrically couple MEMS package 10 toe.g., a smart phone or a digital camera (represented as generic item28).

As will be discussed below in greater detail,micro-electrical-mechanical system (MEMS) actuator 24 may be sized sothat it may fit within a recess in printed circuit board 12. The depthof this recess within printed circuit board 12 may vary depending uponthe particular embodiment and the physical size ofmicro-electrical-mechanical system (MEMS) actuator 24.

In some embodiments, some of the components of MEMS package 10 may bejoined together using various epoxies/adhesives. For example, an outerframe of micro-electrical-mechanical system (MEMS) actuator 24 mayinclude contact pads that may correspond to similar contact pads onprinted circuit board 12.

Referring also to FIG. 2A, there is shown multi-axis MEMS assembly 14,which may include optoelectronic device 26 coupled tomicro-electrical-mechanical system (MEMS) actuator 24. As discussedabove, examples of micro-electrical-mechanical system (MEMS) actuator 24may include but are not limited to an in-plane MEMS actuator, anout-of-plane MEMS actuator, and a combination in-plane/out-of-plane MEMSactuator.

When configured to provide in-plane actuation functionality,micro-electrical-mechanical system (MEMS) actuator 24 may include outerframe 30, plurality of electrically conductive flexures 32, MEMSactuation core 34 for attaching a payload (e.g., a device), and attachedoptoelectronic device 26. Optoelectronic device 26 may be coupled toMEMS actuation core 34 of micro-electrical-mechanical system (MEMS)actuator 24 by epoxy (or various other adhesives/materials and/orbonding methods).

Referring also to FIG. 2B, plurality of electrically conductive flexures32 of micro-electrical-mechanical system (MEMS) actuator 24 may becurved upward and buckled to achieve the desired level of flexibility.In the illustrated embodiment, plurality of electrically conductiveflexures 32 may have one end attached to MEMS actuation core 34 (e.g.,the moving portion of micro-electrical-mechanical system (MEMS) actuator24) and the other end attached to outer frame 30 (e.g., the fixedportion of micro-electrical-mechanical system (MEMS) actuator 24).

Plurality of electrically conductive flexures 32 may be conductive wiresthat may extend above the plane (e.g., an upper surface) ofmicro-electrical-mechanical system (MEMS) actuator 24 and mayelectrically couple laterally separated components ofmicro-electrical-mechanical system (MEMS) actuator 24. For example,plurality of electrically conductive flexures 32 may provide electricalsignals from optoelectronic device 26 and/or MEMS actuation core 34 toouter frame 30 of micro-electrical-mechanical system (MEMS) actuator 24.As discussed above, outer frame 30 of micro-electrical-mechanical system(MEMS) actuator 24 may be affixed to circuit board 12 using epoxy (orvarious other adhesive materials or devices).

Referring also to FIG. 3, there is shown a top view ofmicro-electrical-mechanical system (MEMS) actuator 24 in accordance withvarious embodiments of the disclosure. Outer frame 30 is shown toinclude (in this example) four frame assemblies (e.g., frame assembly100A, frame assembly 100B, frame assembly 100C, frame assembly 100D)that are shown as being spaced apart to allow for additional detail.

Outer frame 30 of micro-electrical-mechanical system (MEMS) actuator 24may include a plurality of contact pads (e.g., contact pads 102A onframe assembly 100A, contact pads 102B on frame assembly 100B, contactpads 102C on frame assembly 100C, and contact pads 102D on frameassembly 100D), which may be electrically coupled to one end ofplurality of electrically conductive flexures 32. The curved shape ofelectrically conductive flexures 32 is provided for illustrativepurposes only and, while illustrating one possible embodiment, otherconfigurations are possible and are considered to be within the scope ofthis disclosure.

MEMS actuation core 34 may include a plurality of contact pads (e.g.,contact pads 104A, contact pads 104B, contact pads 104C, contact pads104D), which may be electrically coupled to the other end of pluralityof electrically conductive flexures 32. A portion of the contact pads(e.g., contact pads 104A, contact pads 104B, contact pads 104C, contactpads 104D) of MEMS actuation core 34 may be electrically coupled tooptoelectronic device 26 by wire bonding, silver paste, or eutecticseal, thus allowing for the electrical coupling of optoelectronic device26 to outer frame 30.

MEMS actuation core 34 may include one or more comb drive sectors (e.g.,comb drive sector 106) that are actuation sectors disposed withinmicro-electrical-mechanical system (MEMS) actuator 24. The comb drivesectors (e.g., comb drive sector 106) within MEMS actuation core 34 maybe disposed in the same plane and may be positioned orthogonal to eachother to allow for movement in two axes (e.g., the X-axis and theY-axis). Accordingly, the in-plane MEMS actuator generally (and MEMSactuation core 34 specifically) may be configured to provide linearX-axis movement and linear Y-axis movement.

While in this particular example, MEMS actuation core 34 is shown toinclude four comb drive sectors, this is for illustrative purposes onlyand is not intended to be a limitation of this disclosure, as otherconfigurations are possible. For example, the number of comb drivesectors may be increased or decreased depending upon design criteria.

While in this particular example, the four comb drive sectors are shownto be generally square in shape, this is for illustrative purposes onlyand is not intended to be a limitation of this disclosure, as otherconfigurations are possible. For example, the shape of the comb drivesectors may be changed to meet various design criteria.

Each comb drive sector (e.g., comb drive sector 106) within MEMSactuation core 34 may include one or more moving portions and one ormore fixed portions. As will be discussed below in greater detail, acomb drive sector (e.g., comb drive sector 106) within MEMS actuationcore 34 may be coupled, via a cantilever assembly (e.g., cantileverassembly 108), to outer periphery 110 of MEMS actuation core 34 (i.e.,the portion of MEMS actuation core 34 that includes contact pads 104A,contact pads 104B, contact pads 104C, contact pads 104D), which is theportion of MEMS actuation core 34 to which optoelectronic device 26 maybe coupled, thus effectuating the transfer of movement to optoelectronicdevice 26.

Referring also to FIG. 4, there is shown a top view of comb drive sector106 in accordance with various embodiments of the present disclosure.Each comb drive sector (e.g., comb drive sector 106) may include one ormore motion control cantilever assemblies (e.g., motion controlcantilever assemblies 150A, 150B) positioned outside of comb drivesector 106, moveable frame 152, moveable spines 154, fixed frame 156,fixed spines 158, and cantilever assembly 108 that is configured tocouple moving frame 152 to outer periphery 110 of MEMS actuation core34. In this particular configuration, motion control cantileverassemblies 150A, 150B may be configured to prevent Y-axis displacementbetween moving frame 152/moveable spines 154 and fixed frame 156/fixedspines 158.

Comb drive sector 106 may include a movable member including moveableframe 152 and multiple moveable spines 154 that are generally orthogonalto moveable frame 152. Comb drive sector 106 may also include a fixedmember including fixed frame 156 and multiple fixed spines 158 that aregenerally orthogonal to fixed frame 156. Cantilever assembly 108 may bedeformable in one direction (e.g., in response to Y-axis deflectiveloads) and rigid in another direction (e.g., in response to X-axistension and compression loads), thus allowing for cantilever assembly108 to absorb motion in the Y-axis but transfer motion in the X-axis.

Referring also to FIG. 5, there is shown a detail view of portion 160 ofcomb drive sector 106. Moveable spines 154A, 154B may include aplurality of discrete moveable actuation fingers that are generallyorthogonally-attached to moveable spines 154A, 154B. For example,moveable spine 154A is shown to include moveable actuation fingers 162Aand moveable spine 154B is shown to include moveable actuation fingers162B.

Further, fixed spine 158 may include a plurality of discrete fixedactuation fingers that are generally orthogonally-attached to fixedspine 158. For example, fixed spine 158 is shown to include fixedactuation fingers 164A that are configured to mesh and interact withmoveable actuation fingers 162A. Further, fixed spine 158 is shown toinclude fixed actuation fingers 164B that are configured to mesh andinteract with moveable actuation fingers 162B.

Accordingly, various numbers of actuation fingers may be associated with(i.e. coupled to) the moveable spines (e.g., moveable spines 154A, 154B)and/or the fixed spines (e.g., fixed spine 158) of comb drive sector106. As discussed above, each comb drive sector (e.g., comb drive sector106) may include two motion control cantilever assemblies 150A, 150Bseparately placed on each side of comb drive sector 106. Each of the twomotion control cantilever assemblies 150A, 150B may be configured tocouple moveable frame 152 and fixed frame 156, as this configurationenables moveable actuation fingers 162A, 162B to be displaceable in theX-axis with respect to fixed actuation fingers 164A, 164B (respectively)while preventing moveable actuation fingers 162A, 162B from beingdisplaced in the Y-axis and contacting fixed actuation fingers 164A,164B (respectively).

While actuation fingers 162A, 162B, 164A, 164B (or at least the centeraxes of actuation fingers 162A, 162B, 164A, 164B) are shown to begenerally parallel to one another and generally orthogonal to therespective spines to which they are coupled, this is for illustrativepurposes only and is not intended to be a limitation of this disclosure,as other configurations are possible. Further and in some embodiments,actuation fingers 162A, 162B, 164A, 164B may have the same widththroughout their length and in other embodiments, actuation fingers162A, 162B, 164A, 164B may be tapered.

Further and in some embodiments, moveable frame 152 may be displaced inthe positive X-axis direction when a voltage potential is appliedbetween actuation fingers 162A and actuation fingers 164A, whilemoveable frame 152 may be displaced in the negative X-axis directionwhen a voltage potential is applied between actuation fingers 162B andactuation fingers 164B.

Referring also to FIG. 6, there is shown a detail view of portion 200 ofcomb drive sector 106. Fixed spine 158 may be generally parallel tomoveable spine 154B, wherein actuation fingers 164B and actuationfingers 162B may overlap within region 202, wherein the width of overlapregion 202 is typically in the range of 10-50 microns. While overlapregion 202 is described as being in the range of 10-50 microns, this isfor illustrative purposes only and is not intended to be a limitation ofthis disclosure, as other configurations are possible.

Overlap region 202 may represent the distance 204 where the ends ofactuation fingers 162B extends past and overlap the ends of actuationfingers 164B, which are interposed therebetween. In some embodiments,actuation fingers 162B and actuation fingers 164B may be tapered suchthat their respective tips are narrower than their respective bases(i.e., where they are attached to their spines). As is known in the art,various degrees of taper may be utilized with respect to actuationfingers 162B and actuation fingers 164B. Additionally, the overlap ofactuation fingers 162B and actuation fingers 164B provided by overlapregion 202 may help ensure that there is sufficient initial actuationforce when an electrical voltage potential is applied so that MEMSactuation core 34 may move gradually and smoothly without any suddenjumps with varying the applied voltage. The height of actuation fingers162B and actuation fingers 164B may be determined by various aspects ofthe MEMS fabrication process and various design criteria.

Length 206 of actuation fingers 162B and actuation fingers 164B, thesize of overlap region 202, the gaps between adjacent actuation fingers,and actuation finger taper angles that are incorporated into variousembodiments may be determined by various design criteria, applicationconsiderations, and manufacturability considerations, wherein thesemeasurements may be optimized to achieve the required displacementutilizing the available voltage potential.

As shown in FIG. 3 and as discussed above, MEMS actuation core 34 mayinclude one or more comb drive sectors (e.g., comb drive sector 106),wherein the comb drive sectors (e.g., comb drive sector 106) within MEMSactuation core 34 may be disposed in the same plane and may bepositioned orthogonal to each other to allow for movement in two axes(e.g., the X-axis and the Y-axis).

Specifically and in this particular example, MEMS actuation core 34 isshown to include four comb drive sectors (e.g., comb drive sectors 106,250, 252, 254). As discussed above, comb drive sector 106 is configuredto allow for movement along the X-axis, while preventing movement alongthe Y-axis. As comb drive sector 252 is similarly configured, comb drivesector 252 may allow for movement along the X-axis, while preventingmovement along the Y-axis. Accordingly, if a signal is applied to combdrive sector 106 that provides for positive X-axis movement, while asignal is applied to comb drive sector 252 that provides for negativeX-axis movement, actuation core 34 may be displaced in a clockwisedirection. Conversely, if a signal is applied to comb drive sector 106that provides for negative X-axis movement, while a signal is applied tocomb drive sector 252 that provides for positive X-axis movement,actuation core 34 may be displaced in a counterclockwise direction.

Further, comb drive sectors 250, 254 are configured (in this example) tobe orthogonal to comb drive sectors 106, 252. Accordingly, comb drivesectors 250, 254 may be configured to allow for movement along theY-axis, while preventing movement along the X-axis. Accordingly, if asignal is applied to comb drive sector 250 that provides for positiveY-axis movement, while a signal is applied to comb drive sector 254 thatprovides for negative Y-axis movement, actuation core 34 may bedisplaced in a counterclockwise direction. Conversely, if a signal isapplied to comb drive sector 250 that provides for negative Y-axismovement, while a signal is applied to comb drive sector 254 thatprovides for positive Y-axis movement, actuation core 34 may bedisplaced in a clockwise direction.

Accordingly, the in-plane MEMS actuator generally (and MEMS actuationcore 34 specifically) may be configured to provide rotational (e.g.,clockwise or counterclockwise) Z-axis movement

As stated above, examples of micro-electrical-mechanical system (MEMS)actuator 24 may include but are not limited to an in-plane MEMSactuator, an out-of-plane MEMS actuator, and a combinationin-plane/out-of-plane MEMS actuator. For example and in the embodimentshown in FIG. 1, micro-electrical-mechanical system (MEMS) actuator 24is shown to include an in-plane MEMS actuator (e.g., in-plane MEMSactuator 256) and an out-of-plane MEMS actuator (e.g., out-of-plane MEMSactuator 258), wherein FIGS. 3-6 illustrate one possible embodiment ofin-plane MEMS actuator 256. Optoelectronic device 26 may be coupled toin-plane MEMS actuator 256; and in-plane MEMS actuator 256 may becoupled to out-of-plane MEMS actuator 258.

An example of in-plane MEMS actuator 256 may include but is not limitedto an image stabilization actuator. As is known in the art, imagestabilization is a family of techniques that reduce blurring associatedwith the motion of a camera or other imaging device during exposure.Generally, it compensates for pan and tilt (angular movement, equivalentto yaw and pitch) of the imaging device, though electronic imagestabilization may also compensate for rotation. Image stabilization maybe used in image-stabilized binoculars, still and video cameras,astronomical telescopes, and smartphones. With still cameras, camerashake may be a particular problem at slow shutter speeds or with longfocal length (telephoto or zoom) lenses. With video cameras, camerashake may cause visible frame-to-frame jitter in the recorded video. Inastronomy, the problem may be amplified by variations in the atmosphere(which changes the apparent positions of objects over time).

An example of out-of-plane MEMS actuator 258 may include but is notlimited to an autofocus actuator. As is known in the art, an autofocussystem may use a sensor, a control system and an actuator to focus on anautomatically (or manually) selected area. Autofocus methodologies maybe distinguished by their type (e.g., active, passive or hybrid).Autofocus systems may rely on one or more sensors to determine correctfocus, wherein some autofocus systems may rely on a single sensor whileothers may use an array of sensors.

Fixed Lens Barrel:

Referring also to FIGS. 7A-7C, there is shown one possible embodiment ofout-of-plane MEMS actuator 258 in various states ofactivation/excitation. Out-of-plane MEMS actuator 258 may include frame260 (which is configured to be stationary) and moveable stage 262,wherein out-of-plane MEMS actuator 258 may be configured to providelinear Z-axis movement. For example, out-of-plane MEMS actuator 258 mayinclude a multi-morph piezoelectric actuator that may be selectively andcontrollably deformable when an electrical charge is applied, whereinthe polarity of the applied electrical charge may vary the direction inwhich the multi-morph piezoelectric actuator (i.e., out-of-plane MEMSactuator 258) is deformed. For example, FIG. 7A shows out-of-plane MEMSactuator 258 in a natural position without an electrical charge beingapplied. Further, FIG. 7B shows out-of-plane MEMS actuator 258 in anextended position (i.e., displaced in the direction of arrow 264) withan electrical charge having a first polarity being applied, while FIG.7C shows out-of-plane MEMS actuator 258 in a retracted position (i.e.,displaced in the direction of arrow 266) with an electrical chargehaving an opposite polarity being applied.

As discussed above, the multi-morph piezoelectric actuator (i.e.,out-of-plane MEMS actuator 258) may be deformable by applying anelectrical charge. In order to accomplish such deformability that allowsfor such linear Z-axis movement, the multi-morph piezoelectric actuator(i.e., out-of-plane MEMS actuator 258) may include a bendingpiezoelectric actuator.

As discussed above, the multi-morph piezoelectric actuator (i.e.,out-of-plane MEMS actuator 258) may include rigid frame assembly 260(which is configured to be stationary) and moveable stage 262 that maybe configured to be affixed to in-plane MEMS actuator 256. As discussedabove, optoelectronic device 26 may be coupled to in-plane MEMS actuator256 and in-plane MEMS actuator 256 may be coupled to out-of-plane MEMSactuator 258. Accordingly and when out-of-plane MEMS actuator 258 is inan extended position (i.e., displaced in the direction of arrow 264)with an electrical charge having a first polarity being applied (asshown in FIG. 7B), optoelectronic device 26 may be displaced in thepositive z-axis direction and towards a lens barrel assembly (e.g., lensbarrel assembly 300, FIG. 8). Alternatively and when out-of-plane MEMSactuator 258 is in a retracted position (i.e., displaced in thedirection of arrow 266) with an electrical charge having an oppositepolarity being applied (as shown in FIG. 7C), optoelectronic device 26may be displaced in the negative z-axis direction and away from a lensbarrel assembly (e.g., lens barrel assembly 300, FIG. 8). Accordinglyand by displacing optoelectronic device 26 in the z-axis with respect toa lens barrel assembly (e.g., lens barrel assembly 300, FIG. 8),autofocus functionality may be achieved.

The multi-morph piezoelectric actuator (i.e., out-of-plane MEMS actuator258) may include at least one deformable piezoelectric portion (e.g.,deformable piezoelectric portions 268, 270, 272, 274) configured tocouple moveable stage 262 to rigid frame assembly 260.

For example and in one particular embodiment, multi-morph piezoelectricactuator (i.e., out-of-plane MEMS actuator 258) may include a rigidintermediate stage (e.g., rigid intermediate stages 276, 278). A firstdeformable piezoelectric portion (e.g., deformable piezoelectricportions 268, 270) may be configured to couple rigid intermediate stage(e.g., rigid intermediate stages 276, 278) to moveable stage 262; and asecond deformable piezoelectric portion (e.g., deformable piezoelectricportions 272, 274) may be configured to couple the rigid intermediatestage (e.g., rigid intermediate stages 276, 278) to rigid frame assembly260.

Linear Z-axis (i.e., out-of-plane) movement of moveable stage 262 ofout-of-plane MEMS actuator 258 may be generated due to the deformationof the deformable piezoelectric portion (e.g., deformable piezoelectricportions 268, 270, 272, 274), which may be formed of a piezoelectricmaterial (e.g., PZT (lead zirconate titanate), zinc oxide or othersuitable material) that may be configured to deflect in response to anelectrical signal. As is known in the art, piezoelectric materials are aspecial type of ceramic that expands or contracts when an electricalfield is applied, thus generating motion and force.

While out-of-plane MEMS actuator 258 is described above as including asingle moveable stage (e.g., moveable stage 262) that enables linearmovement in the Z-axis, this is for illustrative purposes only and isnot intended to be a limitation of this disclosure, as otherconfigurations are possible and are considered to be within the scope ofthis disclosure. For example, out-of-plane MEMS actuator 258 may beconfigured to include multiple moveable stages. For example, if rigidintermediate stages 276, 278 were configured to be separatelycontrollable, additional degrees of freedom (such as tip and/or tilt)may be achievable. For example and in such a configuration, displacingintermediate stage 276 in an upward direction (i.e., in the direction ofarrow 264) while displacing intermediate stage 278 in a downwarddirection (i.e., in the direction of arrow 266) would result inclockwise rotation of optoelectronic device 26 about the Y-axis; whiledisplacing intermediate stage 276 in a downward direction (i.e., in thedirection of arrow 266) while displacing intermediate stage 278 in aupward direction (i.e., in the direction of arrow 264) would result incounterclockwise rotation of optoelectronic device 26 about the Y-axis.Additionally/alternatively, corresponding clockwise and counterclockwiseof optoelectronic device 26 about the X-axis may be achieved viaadditional/alternative intermediate stages.

Moveable Lens Barrel:

While FIG. 8 illustrates lens barrel assembly 300 being mounted in afixed fashion and directly to support assembly 302 (i.e., not movingwith respect to support assembly 302), this is for illustrative purposesonly and is not intended to be a limitation of this disclosure, as otherconfigurations are possible and are considered to be within the scope ofthis disclosure.

For example and referring also to FIG. 9, there is shown anotherembodiment of micro-electrical-mechanical system (MEMS) actuator 24 inwhich lens barrel assembly 300 is coupled to out-of-plane MEMS actuator258, which is (in this embodiment) coupled to support assembly 302. Insuch a configuration, lens barrel assembly 300 may be displaced (in theZ-axis) with respect to optoelectronic device 26 (thus enablingout-of-plane MEMS actuator 258 to perform the above-described autofocusfunctionality for micro-electrical-mechanical system (MEMS) actuator24). Further and as optoelectronic device 26 is coupled to in-plane MEMSactuator 256, such a configuration may allow for optoelectronic device26 to be displaced (linearly in the X-axis and/or Y-axis androtationally in the Z-axis) with respect to lens barrel assembly 300(thus enabling in-plane MEMS actuator 256 to perform the above-describedimage stabilization functionality for micro-electrical-mechanical system(MEMS) actuator 24).

Lens barrel assembly 300 may include a plurality of a discrete lenses(e.g., discrete lenses 304, 306, 308, 310), wherein discrete lenses 304,306, 308, 310 may have various degrees of concavity/convexity.

As discussed above, out-of-plane MEMS actuator 258 may include amulti-morph piezoelectric actuator that may be selectively andcontrollably deformable when an electrical charge is applied, whereinthe polarity of the applied electrical charge may vary the direction inwhich the multi-morph piezoelectric actuator (i.e., out-of-plane MEMSactuator 258) is deformed.

Referring also to FIG. 10, there is shown one illustrative embodiment ofout-of-plane MEMS actuator 258 that includes a multi-morph piezoelectricactuator. In this particular embodiment, out-of-plane MEMS actuator 258may include one or more bending piezoelectric actuators (e.g., bendingpiezoelectric actuator 400); a moveable stage (e.g., moveable stage 402)configured to be affixed to lens barrel assembly 300; and a rigid frameassembly (e.g., rigid frame assembly 404) configured to be affixed tosupport assembly 302. In some embodiments, a plurality of bendingpiezoelectric actuators (e.g., bending piezoelectric actuator 400, 406,408) may be utilized to enhance the displacement of moveable stage 402and, therefore, lens barrel assembly 300) in the Z-axis (whileprohibiting movement of lens barrel assembly 300 in the X-axis and/orY-axis).

As discussed above, the multi-morph piezoelectric actuator (i.e.,out-of-plane MEMS actuator 258) may be deformable by applying anelectrical charge. In order to accomplish such deformability that allowsfor such linear Z-axis movement, the multi-morph piezoelectric actuator(i.e., out-of-plane MEMS actuator 258) may include a bendingpiezoelectric actuator configured to couple moveable stage 402 to rigidframe assembly 404.

Accordingly and when out-of-plane MEMS actuator 258 is in an extendedposition with an electrical charge having a first polarity beingapplied, lens barrel assembly 300 may be displaced in the positivez-axis direction and away from optoelectronic device 26. Alternativelyand when out-of-plane MEMS actuator 258 is in a retracted position withan electrical charge having an opposite polarity being applied, lensbarrel assembly 300 may be displaced in the negative z-axis directionand toward optoelectronic device 26. Accordingly and by displacing lensbarrel assembly 300 in the z-axis with respect to optoelectronic device26, autofocus functionality may be achieved.

General:

In general, the various operations of method described herein may beaccomplished using or may pertain to components or features of thevarious systems and/or apparatus with their respective components andsubcomponents, described herein.

The presence of broadening words and phrases such as “one or more,” “atleast,” “but not limited to” or other like phrases in some instancesshall not be read to mean that the narrower case is intended or requiredin instances where such broadening phrases may be absent.

Additionally, the various embodiments set forth herein are described interms of example block diagrams, flow charts and other illustrations. Aswill become apparent to one of ordinary skill in the art after readingthis document, the illustrated embodiments and their variousalternatives can be implemented without confinement to the illustratedexamples. For example, block diagrams and their accompanying descriptionshould not be construed as mandating a particular architecture orconfiguration.

While various embodiments of the present disclosure have been describedabove, it should be understood that they have been presented by way ofexample only, and not of limitation. Likewise, the various diagrams maydepict an example architectural or other configuration for thedisclosure, which is done to aid in understanding the features andfunctionality that can be included in the disclosure. The disclosure isnot restricted to the illustrated example architectures orconfigurations, but the desired features can be implemented using avariety of alternative architectures and configurations. Indeed, it willbe apparent to one of skill in the art how alternative functional,logical or physical partitioning and configurations can be implementedto implement the desired features of the present disclosure.Additionally, with regard to flow diagrams, operational descriptions andmethod claims, the order in which the steps are presented herein shallnot mandate that various embodiments be implemented to perform therecited functionality in the same order unless the context dictatesotherwise.

Although the disclosure is described above in terms of various exampleembodiments and implementations, it should be understood that thevarious features, aspects and functionality described in one or more ofthe individual embodiments are not limited in their applicability to theparticular embodiment with which they are described, but instead can beapplied, alone or in various combinations, to one or more of the otherembodiments of the disclosure, whether or not such embodiments aredescribed and whether or not such features are presented as being a partof a described embodiment. Thus, the breadth and scope of the presentdisclosure should not be limited by any of the above-described exampleembodiments, and it will be understood by those skilled in the art thatvarious changes and modifications to the previous descriptions may bemade within the scope of the claims.

As will be appreciated by one skilled in the art, the present disclosuremay be embodied as a method, a system, or a computer program product.Accordingly, the present disclosure may take the form of an entirelyhardware embodiment, an entirely software embodiment (includingfirmware, resident software, micro-code, etc.) or an embodimentcombining software and hardware aspects that may all generally bereferred to herein as a “circuit,” “module” or “system.” Furthermore,the present disclosure may take the form of a computer program producton a computer-usable storage medium having computer-usable program codeembodied in the medium.

Any suitable computer usable or computer readable medium may beutilized. The computer-usable or computer-readable medium may be, forexample but not limited to, an electronic, magnetic, optical,electromagnetic, infrared, or semiconductor system, apparatus, device,or propagation medium. More specific examples (a non-exhaustive list) ofthe computer-readable medium may include the following: an electricalconnection having one or more wires, a portable computer diskette, ahard disk, a random access memory (RAM), a read-only memory (ROM), anerasable programmable read-only memory (EPROM or Flash memory), anoptical fiber, a portable compact disc read-only memory (CD-ROM), anoptical storage device, a transmission media such as those supportingthe Internet or an intranet, or a magnetic storage device. Thecomputer-usable or computer-readable medium may also be paper or anothersuitable medium upon which the program is printed, as the program can beelectronically captured, via, for instance, optical scanning of thepaper or other medium, then compiled, interpreted, or otherwiseprocessed in a suitable manner, if necessary, and then stored in acomputer memory. In the context of this document, a computer-usable orcomputer-readable medium may be any medium that can contain, store,communicate, propagate, or transport the program for use by or inconnection with the instruction execution system, apparatus, or device.The computer-usable medium may include a propagated data signal with thecomputer-usable program code embodied therewith, either in baseband oras part of a carrier wave. The computer usable program code may betransmitted using any appropriate medium, including but not limited tothe Internet, wireline, optical fiber cable, RF, etc.

Computer program code for carrying out operations of the presentdisclosure may be written in an object oriented programming languagesuch as Java, Smalltalk, C++ or the like. However, the computer programcode for carrying out operations of the present disclosure may also bewritten in conventional procedural programming languages, such as the“C” programming language or similar programming languages. The programcode may execute entirely on the user's computer, partly on the user'scomputer, as a stand-alone software package, partly on the user'scomputer and partly on a remote computer or entirely on the remotecomputer or server. In the latter scenario, the remote computer may beconnected to the user's computer through a local area network/a widearea network/the Internet (e.g., network 18).

The present disclosure is described with reference to flowchartillustrations and/or block diagrams of methods, apparatus (systems) andcomputer program products according to embodiments of the disclosure. Itwill be understood that each block of the flowchart illustrations and/orblock diagrams, and combinations of blocks in the flowchartillustrations and/or block diagrams, may be implemented by computerprogram instructions. These computer program instructions may beprovided to a processor of a general purpose computer/special purposecomputer/other programmable data processing apparatus, such that theinstructions, which execute via the processor of the computer or otherprogrammable data processing apparatus, create means for implementingthe functions/acts specified in the flowchart and/or block diagram blockor blocks.

These computer program instructions may also be stored in acomputer-readable memory that may direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer-readablememory produce an article of manufacture including instruction meanswhich implement the function/act specified in the flowchart and/or blockdiagram block or blocks.

The computer program instructions may also be loaded onto a computer orother programmable data processing apparatus to cause a series ofoperational steps to be performed on the computer or other programmableapparatus to produce a computer implemented process such that theinstructions which execute on the computer or other programmableapparatus provide steps for implementing the functions/acts specified inthe flowchart and/or block diagram block or blocks.

The flowcharts and block diagrams in the figures may illustrate thearchitecture, functionality, and operation of possible implementationsof systems, methods and computer program products according to variousembodiments of the present disclosure. In this regard, each block in theflowchart or block diagrams may represent a module, segment, or portionof code, which comprises one or more executable instructions forimplementing the specified logical function(s). It should also be notedthat, in some alternative implementations, the functions noted in theblock may occur out of the order noted in the figures. For example, twoblocks shown in succession may, in fact, be executed substantiallyconcurrently, or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved. It will also be notedthat each block of the block diagrams and/or flowchart illustrations,and combinations of blocks in the block diagrams and/or flowchartillustrations, may be implemented by special purpose hardware-basedsystems that perform the specified functions or acts, or combinations ofspecial purpose hardware and computer instructions.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting of the disclosure.As used herein, the singular forms “a”, “an” and “the” are intended toinclude the plural forms as well, unless the context clearly indicatesotherwise. It will be further understood that the terms “comprises”and/or “comprising,” when used in this specification, specify thepresence of stated features, integers, steps, operations, elements,and/or components, but do not preclude the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or groups thereof.

The corresponding structures, materials, acts, and equivalents of allmeans or step plus function elements in the claims below are intended toinclude any structure, material, or act for performing the function incombination with other claimed elements as specifically claimed. Thedescription of the present disclosure has been presented for purposes ofillustration and description, but is not intended to be exhaustive orlimited to the disclosure in the form disclosed. Many modifications andvariations will be apparent to those of ordinary skill in the artwithout departing from the scope and spirit of the disclosure. Theembodiment was chosen and described in order to best explain theprinciples of the disclosure and the practical application, and toenable others of ordinary skill in the art to understand the disclosurefor various embodiments with various modifications as are suited to theparticular use contemplated.

A number of implementations have been described. Having thus describedthe disclosure of the present application in detail and by reference toembodiments thereof, it will be apparent that modifications andvariations are possible without departing from the scope of thedisclosure defined in the appended claims.

What is claimed is:
 1. A multi-axis MEMS assembly comprising: amicro-electrical-mechanical system (MEMS) actuator configured to providelinear three-axis movement, the micro-electrical-mechanical system(MEMS) actuator including: an in-plane MEMS actuator, and anout-of-plane MEMS actuator including a multi-morph piezoelectricactuator; an optoelectronic device coupled to the in-plane MEMSactuator; and a lens barrel assembly coupled to the out-of-plane MEMSactuator.
 2. The multi-axis MEMS assembly of claim 1 wherein the lensbarrel assembly includes a plurality of discrete lenses.
 3. Themulti-axis MEMS assembly of claim 1 wherein the in-plane MEMS actuatoris an image stabilization actuator.
 4. The multi-axis MEMS assembly ofclaim 1 wherein the in-plane MEMS actuator is configured to providelinear X-axis movement and linear Y-axis movement.
 5. The multi-axisMEMS assembly of claim 4 wherein the in-plane MEMS actuator is furtherconfigured to provide rotational Z-axis movement.
 6. The multi-axis MEMSassembly of claim 1 wherein the out-of-plane MEMS actuator is anautofocus actuator.
 7. The multi-axis MEMS assembly of claim 1 whereinthe out-of-plane MEMS actuator is configured to provide linear Z-axismovement.
 8. The multi-axis MEMS assembly of claim 1 wherein themulti-morph piezoelectric actuator includes a bending piezoelectricactuator.
 9. The multi-axis MEMS assembly of claim 1 wherein themulti-morph piezoelectric actuator includes: a moveable stage configuredto be affixed to the lens barrel assembly.
 10. The multi-axis MEMSassembly of claim 9 wherein the multi-morph piezoelectric actuatorfurther includes: a rigid frame assembly.
 11. The multi-axis MEMSassembly of claim 10 wherein the multi-morph piezoelectric actuatorfurther includes: at least one deformable piezoelectric portionconfigured to couple the moveable stage to the rigid frame assembly. 12.The multi-axis MEMS assembly of claim 10 wherein the rigid frameassembly of the multi-morph piezoelectric actuator of the out-of-planeMEMS actuator is configured to be coupled to a support assembly.
 13. Amulti-axis MEMS assembly comprising: a micro-electrical-mechanicalsystem (MEMS) actuator configured to provide linear three-axis movement,the micro-electrical-mechanical system (MEMS) actuator including: anin-plane MEMS actuator, and an out-of-plane MEMS actuator including amulti-morph piezoelectric actuator; an optoelectronic device coupled tothe in-plane MEMS actuator; and a lens barrel assembly coupled to theout-of-plane MEMS actuator; wherein the in-plane MEMS actuator is animage stabilization actuator and the out-of-plane MEMS actuator is anautofocus actuator.
 14. The multi-axis MEMS assembly of claim 13 whereinthe in-plane MEMS actuator is configured to provide linear X-axismovement and linear Y-axis movement.
 15. The multi-axis MEMS assembly ofclaim 14 wherein the in-plane MEMS actuator is further configured toprovide rotational Z-axis movement.
 16. The multi-axis MEMS assembly ofclaim 13 wherein the out-of-plane MEMS actuator is configured to providelinear Z-axis movement.
 17. A multi-axis MEMS assembly comprising: amicro-electrical-mechanical system (MEMS) actuator configured to providelinear three-axis movement, the micro-electrical-mechanical system(MEMS) actuator including: an in-plane MEMS actuator, and anout-of-plane MEMS actuator including a multi-morph piezoelectricactuator; an optoelectronic device coupled to the in-plane MEMSactuator; and a lens barrel assembly coupled to the out-of-plane MEMSactuator; wherein the multi-morph piezoelectric actuator includes: amoveable stage configured to be affixed to the lens barrel assembly, arigid frame assembly, and at least one deformable piezoelectric portionconfigured to couple the moveable stage to the rigid frame assembly 18.The multi-axis MEMS assembly of claim 17 wherein the rigid frameassembly of the multi-morph piezoelectric actuator of the out-of-planeMEMS actuator is configured to be coupled to a support assembly.